HM Prison Pentonville is a prison built in 1842 in North London. Its design was influenced by the "separate system" developed at Eastern State Penitentiary in Philadelphia.
HM Prison Pentonville is a prison built in 1842 in North London. Its design was influenced by the "separate system" developed at Eastern State Penitentiary in Philadelphia.
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Prisons 
http://www.thesun.co.uk/sol/homepage/news/article2145981.ece